Molding glass on metallic thimbles



(No Model.)

G. H. LOMAX. Molding Glass on Metallic Thimbles. No. 236,709.

Patented Aug. 3, 1880.

` enr loma@ 5 wao' wAsmNGTON D C UNITED STATES PATENT OFFICE.

GEORGE H. LOMAX, OF SOMERVILLE, MASSACHUSETTS.

MOLDING GLASS ON METALLIC THIMBLES.

SPECIFICATION forming part of Letters Patent No. 230,709, dated August 3, 1880. Application filed June 14, 1880. (No model.)

To all whom it may concern:

Beitknown tha-t1, GEORGE HENRY LOMAX, ot' Somerville, of the county of Middlesex and State of lvlassachusetts, have invented a new and useful improvement in Molding Glass on Metallic lhimbles or various other articles of like character; and l do hereby declare the same to be described in the following specilication. reference heilig had to the accompanying drawing, whichrepresen'ts a transverse section of a glass lamp-body molded upon such a thimole or tubular socket.

The nature of my invention is set forth in the claim hereinafter presented.

In such drawing, A denotes a lamp-body having projectingup from its bottom a socketed standard, B, molded upon and about a metallic re-enforce or thimble. (j, both standard and re-enforce being open at their lower and closed at their upper ends, as shown.

In attempting to press in a mold a glass lamp-body with a socketcd standard upon a brass or metallic thimble or re-enforce properly sustained in the mold, l have found it very difficult, if not impossible, to do so without the glass fusing the metal and adhering more or less to its surface, and in consequence thereof crackin g or breakingiu numerous places While in the act of casting or setting on the reenforce.

I have discovered, however, that by first coating` the entire outer surface of tlre re enforce with aheat-resisting mediumsuch as powderedpluinbago orasbestus,for instancethe glass, on being cast in the mold and upon the re-ent'orce will not fuse it and adhere to it, and by reason thereof become cracked in cooling, land that it will contract firmly upon the re-enforce, and such re-enforce will remain in its normal condition.

What therefore l claim as my invention or discovery in the art ot' molding glass upon and around a thimble or reenforce, as described, is-

`The applica-tion of a heat-resisting coating, substantially as explained, to the re-enfoi'ce, and molding the glass directly upon such coating and about there enforce, as set forth, such coating, as a slow conductor ot' heat, operating to prevent fusing of the metal, and also to prevent the adhesion of the glass thereto, and consequent subsequent cracking of itwhilein the act of hardening or solidifying.

GEO. HENRY LOMAX.

Witnesses R. H. EDDY, WM. W. LUNT. 

